Ceph » CephFS

While running libcephfs client aio tests with object cacher disabled after fixing the issue https://tracker.ceph.com/issues/68146 and https://tracker.ceph.com/issues/68308, the client crashes
with the assert "ceph_assert(len > 0)"

Reproducer:
1. Included the fix for https://tracker.ceph.com/issues/68146 and https://tracker.ceph.com/issues/68308
2. Ran libcephfs client aio tests on vstart cluster as below
- bin/ceph_test_client --client_oc=false
3. TestClient.LlreadvLlwritevZeroBytes fails (src/test/client/nonblocking.cc)

Please find the traceback below

    ceph/src/osdc/Striper.cc: 186: FAILED ceph_assert(len > 0)

    Traceback:
     ceph version Development (no_version) squid (dev)
     1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x125) [0x7fc0a340aafe]
     2: (ceph::register_assert_context(ceph::common::CephContext*)+0) [0x7fc0a340ad20]
     3: (Striper::file_to_extents(ceph::common::CephContext*, file_layout_t const*, unsigned long, unsigned long, unsigned long, unsigned long, boost::container::small_vector<striper::Lightweight
ObjectExtent, 4ul, void, void>*)+0x184) [0x562727e13ab4]
     4: (Striper::file_to_extents(ceph::common::CephContext*, char const*, file_layout_t const*, unsigned long, unsigned long, unsigned long, std::vector<ObjectExtent, std::allocator<ObjectExtent
> >&, unsigned long)+0x97) [0x562727e145d1]
     5: (Striper::file_to_extents(ceph::common::CephContext*, inodeno_t, file_layout_t const*, unsigned long, unsigned long, unsigned long, std::vector<ObjectExtent, std::allocator<ObjectExtent> 
>&)+0x75) [0x562727d29520]
     6: (Filer::read_trunc(inodeno_t, file_layout_t const*, snapid_t, unsigned long, unsigned long, ceph::buffer::v15_2_0::list*, int, unsigned long, unsigned int, Context*, int)+0x61) [0x562727d66ea5]
     7: (Client::C_Read_Sync_NonBlocking::retry()+0x10c) [0x562727cd8a8e]
     8: (Client::_read(Fh*, long, unsigned long, ceph::buffer::v15_2_0::list*, Context*)+0x578) [0x562727d10cb6]
     9: (Client::_preadv_pwritev_locked(Fh*, iovec const*, int, long, bool, bool, Context*, ceph::buffer::v15_2_0::list*, bool, bool)+0x3a7) [0x562727d18159]
     10: (Client::ll_preadv_pwritev(Fh*, iovec const*, int, long, bool, Context*, ceph::buffer::v15_2_0::list*, bool, bool)+0x179) [0x562727d18b99]
     11: (TestClient_LlreadvLlwritevZeroBytes_Test::TestBody()+0x592) [0x562727ca5352]
     12: (void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*)+0x1b) [0x562727d9dea3]
     13: (void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*)+0x80) [0x562727da2b26]
     14: (testing::Test::Run()+0xb4) [0x562727d927ae]
     15: (testing::TestInfo::Run()+0x104) [0x562727d92988]
     16: (testing::TestSuite::Run()+0xb2) [0x562727d92b34]
     17: (testing::internal::UnitTestImpl::RunAllTests()+0x36b) [0x562727d95303]
     18: (bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*)+0x1b) [0x562727d9e15f]
     19: (bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*)+0x80) [0x562727da3083]
     20: (testing::UnitTest::Run()+0x63) [0x562727d92813]
     21: (RUN_ALL_TESTS()+0x11) [0x562727c828d9]
     22: main()